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sparc64: Clean up 64-bit mmap exclusion defines.

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Older UltraSPARC chips had an address space hole due to the MMU only
supporting 44-bit virtual addresses.

The top end of this hole also has the same value as the current
definition of PAGE_OFFSET, so this can be confusing.

Consolidate the defines for the userspace mmap exclusion range into
page_64.h and use them in sys_sparc_64.c and hugetlbpage.c

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Bob Picco <bob.picco@oracle.com>
This commit is contained in:
David S. Miller
2013-09-18 11:58:32 -07:00
parent 10d0c9705e
commit c920745e69
3 changed files with 15 additions and 7 deletions
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3
arch/sparc/kernel/sys_sparc_64.c
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@@ -39,9 +39,6 @@ asmlinkage unsigned long sys_getpagesize(void)
return PAGE_SIZE;
}
#define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
#define VA_EXCLUDE_END (0xfffff80000000000UL + (1UL << 32UL))
/* Does addr --> addr+len fall within 4GB of the VA-space hole or
* overflow past the end of the 64-bit address space?
*/